Mineral - Bayldonite
Bayldonite
Chemical Properties
Mineral Class
Arsenates
Toxicity
middle
Formula
PbCu₃[OH|AsO₄]₂
Unit Cell
a=10.15 b=5.89 c=14.08 β=106° Z=4
Physical Properties
Hardness
4.5
Streak
green
Density
Heavy (3,5-6)
Cleavage
Fracture
conchoidal,
uneven
Tenacity
Brittle
Optical Properties
Color
green
Birefringence
0.040
Luster
Resinous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-prismatic - 2/m
Space Group
C2/c (15)
Habit
crusty
Formation
In the oxidation zone of lead-copper deposits
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Bayldonite
Composition
Elements
Mass
As₂O₅
31.76
CuO
30.88
PbO
30.13
H₂O
4.58
England (Palache et al. 1952)
Name and first discovery: Named after the English physicist John Bayldon (1837-1872). First discovered in 1865
Chemism:
Synonyms: cuproplumbite, parabayldonite
Varieties:
Abbreviation: Bay
Literature
Palache, C., Berman, H., & Frondel, C. (1952). Dana's system of mineralogy. GeologiskaFöreningen i Stockholm Förhandlingar, 74(2), 218-219.